Spidersilk the novel is rich in cultural references. During one of Mark's dreams he meets with a Native American who helps him unlock some keys that lead to his success. This reference alone already hints at Mark's powers as it is said to see a Native American tends to mean you are breaking free of something. There are so many incredible stories surrounding Native Americans and dreams.
If you'd like to know more about some of these qualities check out this informative site: http://voices.yahoo.com/native-american-influences-dreaming-3627473.html?cat=37